Grinding-mill.



' H. C. ROBINSON.

GRINDING MILL.

APPLIOATION FILED HAB. 17, 1903.

PATENTED JUNE 12, 1906.`

4 SHEETS- SHEET 1.

PATENTED JUNE 12, 1906. H. c. ROBINSON. GNINDING MILL.

APPLIOATION FILED HAB 17 1903 4 SHEETS-SHEET 2.

No. 823,365. l PATENTED JUNE 12, 1906. H. G. ROBINSON.

GRINDING MILL.

APPLICATION FILED IAB. 17, 1903.

4 SHEETS-SHEET 3.

No.v 823,365.

PATENTED JUNE 12, 1906. H. G. ROBINSON. l GRINDING MILL.

APPLICATION FILED MAR. 17, 1903.

4 SHBETS-SHEET 4.

Harl' l?? `HARRY o. ROBINSON, OE MUNOY, PENNSYLVANIA.

GRINDING-MILL.

To all` whom, it may concern:

Be it known that I, HARRY C. ROBINSON,

a citizen of the United States, residing atl Muncy, in the county of Lycoming and State of Pennsylvania, have invented new and useful Improvements in Grinding-Mills, of which 'the following is a specification.

This invention relates to grinding-mills, and it is of particular adaptation to that class of mills having one Or more pairs of horizontally-disposed grinding-rolls the peripheries:

of which are adapted to travel ap roximately in contact, althou h, of course, do not intend to limit mysezllf in this respect, for some of the features of the invention may be emploed with equal facility in mills of other un s.

The objects and advantages of the invention will be set forth at length in the following description, while the novelty thereof will be covered in the claims succeeding such description. Y

Said invention is shown in one simple and convenient embodiment thereof in the drawings accompanying and forming a part of this specification, and 1n which- Figure l is an elevation as seen fromone side of the machine. Fig. 2 is a similar view as seen from the opposite side thereof. Fig. 3 is a sectional elevation of the same viewed from the same side thereof as. that illustrated in Fig. 1. Fig. 4 is a detail view in sectional elevation of part of the means for shifting the movable bearings of oneof the grinding-rolls.

Fi 5 is a like view of an adjustable or movabflre bearing. Fig. 6 .is a diagrammatic elevation showing the pulleys and belting employed for driving the grinding-rolls, the machine and certain other parts being shown by dotted lines.

Like characters refer to like Iparts throughout the several figures.

The framework for ca g the different parts of the machine may e of any suitable character. That re lresented is denoted in a generalwayby 2 an is provided upon its top with bearings, hereinafter more particularly described, for the grinding-rolls, there being in the present case two pairs of these rolls which, as is customary in this type of mill, are Operated at differential speeds.

The said two pairs of rolls are housed in the casing 3, which rests upon the framework. Both the framework and the casing'3, mounted thereon, are all of a construction familiar in this art, and for, this reason it is unneces- Specication of Letters Patent.

Application led March 17, 1903. Serial No. 148,215.

Patented June 12, 1906.

sary to describe the same in detail. The casing is provided with the usual feed-controllin devices.

previously indicated, the machine in the (present instance involvestwo pairs of grin ing-rolls. Each pair involves a high speed and a low speed roll, and the ratios of velocity between the same may be that ordinarily employed in this art. The fast-speed roll is generally driven at six hundred revolutions to the minute, or in this neighborhood, while the low-s eed roll is driven at from one hundred an fifty to two hundred revolutions to the minute. The high-speed rolls are denoted by 4 in each case, the lowspeed rolls being designated by 5, and their peripheries or working surfaces run practically in contact, said low-speed rolls, as will hereinafter appear, being adjustable toward and from the companion or high-speed rolls in order to regulate the character of the product of the machine. The bearings for the shaftsl of the high-speed rolls are denoted by 6 and are stationary and located at opposite sides of the framework 2. The bearings 6 are generally made .integral with the framework. A

The bearings for the shafts of the low-speed rolls are shown at 7 and are movable toward and from the respective stationary bearings in order to provide either for the adjustment of the rolls or for throwing them out of actlon when the machine is not grinding or for other purposes.

The be rin s 7, which, as is understood, are bodily s table relative to the stationary bearings, consist, referably, of slides mounted in some suitab e manner upon the framework. They may be mounted as indicated clearly in Fig. 5.

. As it is necessary in mills involvin two grinding-rolls traveling a proximate y -1n contact to drive one of sai rolls at a higher s eed than the other, it is my intention to rive the rolls supported by the stationary bearings at a higher speed than the other rolls. An advantage follows this. When the adjustably-mounted rolls are driven at a high speed, there is a decided tendency when the rolls are in operation, due to their high velocity, to loosen the adjusting means, so that accuracy in the grade of the product is not assured. To overcome such derangement ofthe adjusting means, I drive the adjustable rolls at a low speed, the high-speed IIO rolls beingsupported by fixed bearings. It

will be seen that the movable bearings 7 are both on the same side of the coperating fixed bearings, by virtue of .which the belting which is employed to operate the rolls can be arranged in a very compact manner, thereby saving considerable space, which is an important factor. v

In Fig. 6 I have illustrated diagrammatically the driving mechanism for operating the co erating rolls. A

pon one end of each of the shafts of the high-speed rolls is fastened a pulley 8, the

' shafts of the low-speed rolls carrying like pulthe respective the leys 9 at the opposite side of the machine. The driver for the highest-speed rolls is denoted by 10 and is supportedupon a lineshaft 11, mounted upon the'hanger 1'2, fas'- tened to the under side of the floor upon which the mill is mounted, said fioor having, of course, openings for the passage of the driving-belts. The belt for transferring motion from the driving-pulley 10 to the u-lleys 8 is denoted by 13 and' is passed un er the lower half of the driving-pu ley and over the upper halves of the horzontally-alined driven pu leys, it having a depending bight between the outside runs thereof, passing around the under portion of the idler-pulley 14, mounted on the framework 2 just below the two driven pulleys 8. The driver for the low-speed rolls 5 is designated by 15, and it is fixed to the same line-,shaft 11 .to which the high-speed driver 10 is secured. Said shaft 11 ma be operated in any suitable manner. The -iving-'belt for transferring the motion from the pulley 15 is shown at '16, it passing around' the under side of said driver orpulley 15A and around the upper sides of the pulleys 9, the outer branches of the band extending downward and around the idler or guide pulley 17, sup orted suitably by the hanger 12 below the ine-shaft 11. The twc drivers 1'0 and 15 are operated in unison from the same shaft, and as they are of different diameters, as illustrated, they serve to transmit, through the intermediate belting and other parts, proper relative speeds to the grinding-rolls of jairs. In the-diagrammatic figure numbere 6 I have illustrated by ar.-

rows the direction of movement of the belts,`

pulleys, &c., which figure shows the compact arrangement of the several arts.

It will be understoodt at the movable. bearings 7 for the low-speed rolls 5 have been set forth as consisting of horizontally-movable slides, by virtue of which the slides can be manipulated to adjust the low-speed rolls relatively to the companion high-speed rolls or to move said rolls entirely away from the companion rolls in case it is desired to stop grinding or in caseany unusual obstruction should be caught between such rolls. I provide means for shifting simultaneously or individually the bearings for the low-speed rolls. The means for bodily shifting 'the mov'able bearings either simultaneously or se arately will be hereinafter described.

n connection with the low-speed .rolls I provide means for tramming the same, whereby the surfaces of the respective rolls can be brought into absolutely correct grinding relation, and the tramming means, as wil hereinafter a pear, operate entirely independently of t e adjusting and shifting mechanism for said low-speed rolls, whereby the latter can be bodily shifted without affecting their set after they have been tra-mmed. Each movable bearing 7 includes in its make-up a pivoted block 20, which direct-ly sustains the journals of a low-speed roll and which is mounted u onthe body of the bearings. Referring to llrig. 3, it will be seen that both pivoted blocks are mounted upon what is represented as being the left side of theres eetive bodies of the movable bearings 7. ach ivoted block is provided at the side thereogfarthest from the pivot with a projecting flange or toe, through the outermost side of which is tapped a screw 22, the lower end of which isadapted' to bear against the upper horizontal face of the body of the bearing or slide 7, which body is fixed relatively to the 4pivoted block. The toes or flanges 21 between the vertically-disposed screws 22 and the pivots thereof are perforated to receive the vertically-disposed screws 23, the heads of which are adapted to fit against the upper sides of said flan es and the lower en s of It be assumed that it is desired to lower the end of the roll 5 on the left in Fig. 3 nearest to view. To do this, the adjustingscrew 22 is backed out of its seat in the flange 21, thereby permitting the flange to d-rop while the screw is bein rotated, and when the flanged end has been owered the requisite distance the adjusting-screws 23 will be run into their seats until their heads abut against said 'ange, at which point the block 20 will' be firmly locked. To reverse this opera-tion, the adjusting-screws 23 are backed out of. their seats the desired distance, after which the screw 22 is rotated to the right,it bein assumed, of course, that it has a right-han thread, until'the-upper face of the flange abuts ainst the headset said screws 23, at which time the block is locked in its elevated osition. Durin the raising or 'lowering o the block the adjacent endv of the roll 5 is of course being carried therewith. In tram- Amin it may be necessary toadjust both bloc s 20'either b raising or loweri'i the same in order to ring the surfaces o two rolls into proper relation, orv it may be necessary to mani ulate onl one of the blocks to accom lish t e desire end. Traniminr of therol s, however, can be Yquickly secure 'by 13o the'means just set forth. Such tramming means when adjusted serve to maintain the rolls in the correct relation and being, as will hereinafter ap ear, independent ofthe mech anism for shi ting the bearings 7 cannot be affected when such bearings are moved back and forth `to vary the distance between the rolls or to throw them well out of contact. The movable bearings or slides 7 have upon their under sides the depending lugs 25, which are adapted upon the back and forth motion of the siides to traverse channels 26 in the framework 2. The threaded ends of rods 27 extend through such de ending lugs and are embraced at-opposite si es ofthe latter by check and holding nuts, each denoted by 28. The rods 27 extend through the upper ends of the rock-arms 29, fulcrumed between their ends'to the framework 2 and the lower arms of which project through slots in said framework, and they are connected to actuating devices, hereinafter more particularly described, foi effecting the shifting bodily of the slides of the respective lows eed rolls individually or simultaneously. he outer end of the rod 27 at the left is provided with a hand-wheel 30 in the form of 'a nut threaded thereto and which abuts against the upper outer side of the adjacent rockarm 29, a like hand-wheel or nut 30 bein threaded onto the rod 27 at the right ancgl abutting against the inner upper side of the adjacent rock-arm 29. On the upper inner sid e of the rock-arm at the left is a soc et to receive the coiled push-spring 31, bearing against the adjustable collar 32 onthe coperating rod, said collar 32 being situated upon the inner side of the coperating rock-arm 29. A like collar 32 is fastened to the rod 27 on the right upon the outer side of the adjacent rock-arm and receives the thrust of a coiled pushspring 31 exactly like the one just mentioned, the inner end of which fits in a socket upon the outer upper side of the coperating rockarm 29. By turning either of the adjusting hand-wheels to the right the coactingslides 7, through the intermediate mechanism, will be moved toward the companion fixed bearings 6, thespring 31 adjacent thereto being put under tension by the movement of the rod 27. Upon the reverse movement of the hand-wheel the rod 27 will be moved in a direction to carry the appropriate slides away from the fixed bearings by means of the appropriate coiled spring 31. The hand-wheels or nuts 30 in connection with the springs 31 and allied parts constitute means for adjusting the movably-mounted or low-speed rolls toward or from the complemental rolls in order to regulate the grade of the product.

To the lower ends of the rock-arms 29 are ivoted the rods 35, each extending inward om its coacting rock-arms and through-projectionsor ears 36 upon the framework and terminating at its inner end in a head 37.

Coiled pushfsprings 38 surround the rods, the terminal coils of the springs bearingagainst the projection or ears 36 and also against the stops 39 on`the respective rods 35, which when such obstruction has passed by the rolls they willl be returned to their initial positions by the springs 38.

Means are provided in connection with the rods 35 for-moving the same longitudinally, whereby the bearings 7, connected therewith in the manner hereinbefore described, may be shifted. I will now describe a simple means for securing such longitudinal movement of the rods either simultaneously or one pair independently of the other, it being understood that two rods are connected with the movable bearings for each low-speed or shiftable roll 5.

The rock-shafts 40 are supported in horizontal alinement with each other by the framework 2, the opposite ends of the rockshafts extending beyond the side' faces of such framework and having wrist or crank pins 41 (see Fi 4) extendingvthrough perforations in theeads 37 of the rods 35. One rock-shaft 40 carries at one end a hand-lever 42, the other rock-shaft having at the other end a similar lever, also designated by 42. These rock-arms are so connected with the shaft that when a miller faces either what is shown as the left or right in Fi s. 1 and 2, respectively, thehand-lever 42 l be within reach of his right hand in order that the same may be manipulated to simultaneously operate two rods or all-four rods 35.

Referring to Fi 1, the wrist-pins 41 are shown as provide with depending arms v43 having pins 44 at their lower or free ends to iit notches in the under side ofthe bar'45, terminating at its outer ends in handles 46. This bar constitutes a coupler for normally operatively connecting the two rock-shafts 40, and hence the movable bearings or slides IOO IIO

7, whereby the latter may be operated in unison. In Fig. 1 the coupler-bar is shown as connecting the arms 43. Should it be desired to simultaneously move the bearings of the two rolls 5, either hand-lever 42 may be gras ed, and by swinging the one downward or t e other upward the two shafts 40 will, by means of the coupler-bar 45, be simultaneously rocked. When this is done, the upper yend of the rock-arms 29 atthe left in Fig. 1 will be swung inward,'the upper end ofthe rock-arm 29 on the right-hand side ofthe ure being swung outward to thereby move a l the bearings 7 away from the coperating and ISO stationary bearings 6. This procedue is followed when it is desired to throw the mill out of action for any reason. By grasping either lever 42 and lifting the adjacent end of the coupler-bar 45 by means of the handle 46 to disengage the same from the appropriate pin 44 the bearings for the coactin movable lroll can be moved away from the d bearings of the complemental roll. This operation takes lace in casethe feed of the material to the ro ls be stopped,which in some cases occurs through a clogging of the supply-spouts and is a common occurrence. in mills. The rolls when the material is not passing through 'the same during their rotation would naturally interfere with .each other, and this is especially the case when they are corrugated or iluted. When they run approximately in contact free of the material, they will be damaged to a more or less extent. ordinary type of grinding-mills, where two pairs of rolls are built together, it is necessary for the operator in a case like that just mentioned to spread apart both pairs of rolls, and when he comes to readjust or-reset them he has double labor, which isavery annoying and expensive. In some makes of. rolls each pair of rolls has been built separately and independently of the other. Withthis arrangement the operator is obliged to work from one side of the machine to the other in order to spread both pairs, which also possesses the same disadvantages as well as consumin considerable time. Rolls are usually place in a mill on .the lower or first floor in a line running in number from two to twenty-five machines. Thus it will be seen that the labor connected with spreading each pair of rolls independently of the other means that the operator must pass down one side of the line and up the other. He must repeat this procedure when the rolls are put into their grinding relation. By virtue of my invention yan operator can spread any number of rolls in his line without interfering with any other pair, or he can spread or throw together any two pairs of rolls with a single movement of a lever.

The mechanism described therefore constitutesa simple and efficient one for quickly throwing either or both of the adjustablymounted rolls 5 away from the relatively stationary rolls 4. The rock-arms 29 are provided with sto s 47, adapted to engage the upper side of t e framework 2 when said rock-arms are in a vertical position. These stops prevent the movably-mounted rolls 5 from being carried into too close c-ontact with the relatively stationary rolls 4. When either or both of the' hand-levers 42 are actuated by the operator, the springs 38 are placed under compression, so that when said handlevers are released the springs will aid in returning the movable bearings 27, and hence the rolls 5 carried therebyto their primary In the positions. The coupler-bar 45 is free of the arms 43, so that it can be readily raised and dropped into its normal osition.

The invention is not imited to the exact construction hereinbefore described, for many variations may be adopted within the scope of my claims. y

Having described the invention, what I claim is- 1. A grinding-mill including two pairs of differentially-s ceded coperative rolls and bearings there or, the bearings for the highspeed rolls being stationary and those for the low-speed rolls being movable toward and from the com anion stationary bearings, and the bearings or the low-speed rolls both being on the same side of the bearings for the high-speed rolls.

2. A grinding-mill including a roll, stationary bearings for supporting said roll, a pair of slides mounted for movement toward and from the stationary bearings, a second roll carried by the slides, rods connected with the slides, rock-arms connected at their upper ends to the respective rods, rods connected to the lower 4ends of the rock-arms, and manually-controlled means for .moving the lastmentioned rods longitudinally.

3. A grinding-mill including a roll, stationar bearings for supporting said roll, a pair o slides mounted for movement toward and from the stationary bearings, a second roll carried by the. slides, rods connected with the slides, rock-arms connected at their upper ends to the respective rods, rods connected to the lower ends of the rock-arms, a rockshaft having crank-pins at its opposite ends, the last-mentionedrods eing perforated to receive said crank-"ins, and an actuatinglever connected wit the rock-shaft.

4. A grinding-mill including a roll, stationary bearings for supporting the same, a pair of slides, pivotally-mounted blocks on said slides, a second roll directly supported by said pivotally-mounted blocks, rods connected with the slides, rock-arms yieldingly connected at their upper ends to the said rods and provided with sto s adapted normally to engage the framewor of the machine, rods connected with the lower ends of the rockarms, a rock-shaft having crank-pins at its opposite ends, said last-mentioned rods being perforated to receive said crank-pins, and an actuating-lever connected with .said rock'- I shaft` 5. A grinding-mill including a roll, stationary bearings for supporting said roll, a pair of slides, pivotally-mounted blocks on said slides, a second roll supported by the pivotally-mounted blocks, means for adjustmg the pivotally-mounted blocks, a pair of rods connected with said slides, rockers provided with stops to normally engage the framework of the machine, the upper ends of the rockers being perforated to receive said rods, springs 'surrounding the rods and bearing at one end against the rockers, stops upon the rods for engaging the op osite ends ofthe springs, a second pair of ro s connected with the lower ends of the rockers, springs surrounding the last-mentioned rods, the latter having stops to receive one end of the springs and the other 'end of the springs bearing against the framework, a rock-shaft having crank-pins at its opposite ends, said lasty mentioned rods being perforated to receive pair of rook-shafts operatively connected with and adapted, on their motion, to move the respective shiftable rolls, a hand-lever carried by each shaft, said hand-levers being upon opposite sides of the mill, rock-arms Connected with the rock-shafts, both on the same side ofthe mill, having projections, andy a notched coupling device, the notches of which are adapted to lreceive said projections.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit- IIGSSCS. I

HARRY C. ROBINSON. Witnesses:

G. L. PAINTER, MORRIS J. COLLEY. 

